----https://www.nbcmiami.com/news/local/Headline-Jail-Records-Reveal-Cruz-Behavior-Behind-Bars-476060903.htmlBy avoiding a criminal record, Cruz passed a federal background check in February 2017 before purchasing the AR-15-style semiautomatic rifle investigators say was used in the mass shooting. Just one month earlier, he was disciplined with a one-day internal suspension for an “assault” at Marjory Stoneman Douglas High School and evaluated as a potential “threat." It was his second offense for fighting in less than four months, but campus police did not make an arrest in either case...The Broward County Sheriff’s Office received at least 45 calls related to Cruz and his brother dating back to 2008 – including a February 2016 call from a neighbor warning he made a threat on Instagram to "shoot up" the high school, and another last November advising he was collecting guns and knives and appeared to be "a school shooter in the making." Though deputies visited Cruz at his home, they did not try to recover his weapons, despite requests from relatives who feared he planned to use them on his classmates.----